5 thoughts on “How to identify the authenticity of gold?”

  1. The method of identifying the authenticity of gold is:

    1. Seeing the color
    The different luster and color of the gold can be generally distinguished from pure gold, K gold, real gold, fake gold. That is, gold is better yellow (yellow -red), and the color is more than 95%; the positive yellow color is about 80%; the blue and yellow color is about 70%; the yellow color is slightly gray and the color is about 50%. Therefore, there is a formula for "seven green eight yellow, yellow nine five red, yellow leucorrhea ash pairs of gold". For jewelry from Jiu Tibet, there will be a saying that "copper turns green, silver turns black, and gold will never change color".

    . The weight
    D gold is about double the weight of the same volume silver, lead, and tin. True gold has a feeling of falling on the hand, while copper or others only have a sense of heavyness without falling.

    3. Listening to the sound
    When the golden jewelry with high color color is knocked down or threw it hard, the dull sound of "hits, clicks" is made, there is no charm or elasticity, no charm, no elasticity, no elasticity , K Kim has the rhyme, sound, elasticity, the greater the elasticity, the more the rhyme, the more old, the worse the color. The fake or low golden sound is crispy but no dullness. Generally, the sound of "Dangdang" is emitted, and there are surplus sounds.

    4. Folding hardness
    The gold with high color shall be left with large head needles or nails. More than 97%of gold jewelry, after twisting two or three times, wrinkles appear at the bending, also called fish scales; about 95%of gold jewelry, it feels hard when bending, and the fish scales are not obvious; about 90%of the golden gold golden gold; The jewelry is very hard when the bending is bent, without fish scales; gold jewelry containing more impurities, bend twice or three times to break; if it is made for raw gold, the bend is broken. When using this method, the width and thickness of the jewelry should be considered. The thick and width should be hardened, and the thin and narrow ones are softer.

    5. Use the test goldstone to identify the color
    The use of the gold -pairing card (the gold medal of the identified color) and the subject's first jewelry on the test gold stone to make the color of the gold jewelry. This method should be carried out under natural light and sunlight, and cannot be carried out under the direct sunlight and incandescent lamps.
    This in the past often used testing gold stones to determine the general content of gold. Testing gold stones are a mixed black mineral such as quartz and protein -containing quartz, and the gold is drawn on the test stone to see the general shape of the gold. Pure gold: shiny dark yellow, thick yellow; silver gold: light color change slightly green green; gold containing silver greater than 25%of gold: earth white; copper -containing gold: deeper color, red color tone; silver copper tone; Gold: yellow; gold containing zinc, same, nickel: white gold.

    6. Use acid dot
    The golden trail of identified jewelry and cards on the test stone, and use a glass stick to test nitric acid on the golden road. Do not react with acid, so the color is unchanged. If it is not gold or non -pure gold, the Golden Road disappears or changes. The law of changes is "three fast, three slows", that is, the low color disappears quickly, and the high color disappears slowly; Depending on the disappearance of its golden road, compare cards can determine the color of gold jewelry.

    7. Burning with fire
    This will be used to burn red (do not melt the jewelry) with fire (do not melt the jewelry), and observe the color change after cooling. If the color becomes darker or different degrees, it is not pure gold. Generally, the lower the color, the stronger the color, and the darkens are all, indicating that it is a fake gold jewelry. After burning red, it is quenched into the water, and the color remains unchanged. It really does not change color when it comes to fire.

    The test, two golds with different purifications, one containing a small amount of impurities, and one is a full -scale gold. Essence The color of the gold necklace with a low purity becomes darker, the section is rough, and the location of the welding medicine is obviously dark; and the golden foot gold still shows the bright golden nature of the gold, the melting surface is smooth and clean, and even brighter than the original.

  2. First, check

    1, check the official logo of gold. Generally, 999 or 990, or 10K, 18K, 22K, 24K. It is not considered lower than 10K, because the content of gold is too low. If you observe with a magnifying glass, you will see more carefully.

    2, ancient gold jewelry will not have obvious official purity logos.

    3, of course, there will also be official signs of counterfeit gold jewelry, so further inspections need to be performed.

    4, find obvious discoloration. Check the wear area of ​​the golden surface, which is usually on the edge of the golden products to check the color change there. If the golden color disappears and becomes another color, then this product is just a gold -plated.

    . The bromine chemistry test

    1. Put the golden product into the alcohol solution for a small meeting.

    2. Put a piece of filter paper into the sperm solution.

    3. At this time, the filter paper becomes gray -purple.

    4, drops 4 drops of bromo -A reagent to the filter paper, if the filter paper becomes white, then this gold product is real gold.

    The test time takes 20 minutes.

    . Magnetic test

    This is a simple test, but it is not a sufficient proof to prove whether it is true gold. You can find a powerful magnet for testing.

    Gold is not a magnetic metal. If your product is attracted by magnets, it is enough to prove that this product is not gold. But you can't prove that it is gold because your product does not respond to magnets, because there are many non -magnetic metals.

    . The density test only has a very small metal density exceeding gold. The density of pure 24k gold is about 19.3 grams/ml, which is much higher than other metals. The density test method is enough to prove that your product is gold. The higher the density, the higher the purity of gold. Make sure your product has no additional gem.

    1. If you do not have equipment in this area, jewelry shops can usually do density testing for you.

    2, you can put your golden products in the container full of water, and then test the volume of overflowing water, and then remove the weight of your gold product, which is the density of your gold product. Keep in mind that different gold purity has different grams/ml ratio: 14k- 12.9 ~ 14.6 grams/ml 18k gold-15.2 to 15.9 grams/ml 18k platinum-14.7 ~ 16.9 grams/ml 22k-17.7%to 17.8 grams to 17.8 grams /Ml.

    . Bite test

    everyone has watched movies, and the mininger bite gold to test it. I also saw that when the Olympic athletes won the gold medal, they would bite their "gold" medal. How simple this test is.

    1, bite gently.

    2. Check your bite marks. The deeper the bite marks, the higher the purity of the gold.

    Actually, this is a not recommended test, which will damage your teeth. What's more, the lead will be given to the gold, and the lead is softer.

  3. Pay content for time limit to check for freenAnswer you, good dear, you can use fire at home to identify the authenticity of gold. First prepare a candle, lit the candle with a lighter, and then clamp the gold with the crickets to burn it on the candle until the surface of the gold is black. Put the black gold in the cold water for cooling. Looking at the color of gold, if the gold is found to return to the golden yellow, it means real gold, because real gold is not afraid of fire refining. If it is fake gold, no matter how long it is cooled, it cannot be restored to the original color.

  4. 1. Look at the color. The gold color with high gold content is red and golden, with a gold content of 80%yellowing, and 70%of the gold content is green. You can judge the gold content according to the color; 2. Look at the weight. Gold is more than doubled than the same volume of silver, lead, and tin, and real gold has a feeling of falling on the hand without feeling of copper or other sense of weight without falling; 3. Listen to the sound, high -quality gold jewelry When it is hard, there is no rhyme, a dull voice, and other metals are crispy but no dullness.

    The first method: look at the print print, if it is a finished gold jewelry product, each piece will have a full gold, or a thousand -footed character print. It is mainly to go to the regular jewelry shop to buy, plus the printing seal, it is generally determined to be true. However, there is a question that whether the content can reach sufficient gold or thousands of feet, it is invisible. This method can only rely on believing in regular jewelry shops.

    The second method: weighing, the density of gold is 19.32, so a little bit, it has a sense of heavyness. There are 10 grams, but only 1 or 2 grams are called. The gold jewelry may be fake. This method is based on experience. People who do not understand are not suitable for this method.
    The third method see the hardness: the hardness of the gold is 2.5, very soft, and the ductility is good. It is like the feeling of a sandwich biscuits open. The fracture is not uniform. This is caused by the ductility of gold. This method also needs to be determined by experience to determine the authenticity. People who do not understand are not suitable.

    The fourth type of fire: This is the golden yellow color that uses professional jewelry to cooler the golden burning and cooled, which is real gold. If it is cooled and cooled, there is a bit of rustling or dull golden yellow, which may not be enough in gold, and it does not reach 99. This method is also more suitable for experienced people. Those who have no experience can also use it, but they cannot argue how much content.

    The fifth method uses machine to test: use professional detection of gold machines to detect the content of gold. This method requires professional equipment and professional operations.

  5. True and false gold generally identify through the following methods
    1, fire burning, gold and oxygen do not respond.
    2, acid point, unusual acid reaction, do not use king water.
    3, bite of the teeth, the real gold is softer
    4, density, Archimedes did that year.
    Reference: xueke.maboshi/hx/hx_sh/hxyshjq/88333
    Pet personally feel that it is best to test with acid, vinegar. If it is real gold, the fire and bite will have a certain impact on the appearance of gold.

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